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   1 /*
   2  * (c) Copyright IBM Corp. 2000, 2001.
   3  * All Rights Reserved.
   4  */
   5 package net.sourceforge.phpdt.internal.corext.template;
   6
   7 import java.util.HashMap;
   8 import java.util.Iterator;
   9 import java.util.Map;
  10
  11 import net.sourceforge.phpdt.internal.corext.template.php.PHPContextType;
  12 import net.sourceforge.phpdt.internal.corext.template.php.HTMLContextType;
  13
  14
  15
  16 /**
  17  * A singleton to keep track of all known context types.
  18  */
  19 public class ContextTypeRegistry {
  20
  21         /** the singleton */
  22         private static ContextTypeRegistry fInstance;
  23
  24         /** all known context types */
  25         private final Map fContextTypes= new HashMap();
  26
  27         /**
  28          * Returns the single instance of this class.
  29          */
  30         public static ContextTypeRegistry getInstance() {
  31                 if (fInstance == null)
  32                         fInstance= new ContextTypeRegistry();
  33
  34                 return fInstance;
  35         }
  36
  37         /**
  38          * Adds a context type to the registry.
  39          */
  40         public void add(ContextType contextType) {
  41                 fContextTypes.put(contextType.getName(), contextType);
  42         }
  43
  44         /**
  45          * Removes a context type from the registry.
  46          */
  47         public void remove(ContextType contextType) {
  48                 fContextTypes.remove(contextType.getName());
  49         }
  50
  51         /**
  52          * Returns the context type if the name is valid, <code>null</code> otherwise.
  53          */
  54         public ContextType getContextType(String name) {
  55                 return (ContextType) fContextTypes.get(name);
  56         }
  57
  58         /**
  59          * Returns an iterator over the registered context type names.
  60          */
  61         public Iterator iterator() {
  62                 return fContextTypes.keySet().iterator();
  63         }
  64
  65         // XXX bootstrap with java and javadoc context types
  66         private ContextTypeRegistry() {
  67                 add(new PHPContextType());
  68                 add(new HTMLContextType());
  69         }
  70
  71 }